Rotary pump



w. A; HATCHER.

- ROTARY PUMP. APPLICATION FILED FEB. I9, 192l- Patentd, 001;. M1922,

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vumtoz W. A. HATCHER.

ROTARY PUMP.

APPLICATION FILED FEB. 19. 192i.

1,431,793; Patented 0017. 10, 11922.

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an. A. HATCHER, OF DETROIT, MICHIGAN, ASSIGNOR T NICKE-HATC EUEQP CQMEANY, 0F GRAND RAPIDS, MICHIGAN, A CORPORATION 0E MICHIGAN.

lhttlfltt star Warren.

ROTARY PUMP.

Application filed February 19, 1921. Serial No. 446,471.

To all whom it may concern:

Be it known that I,.W 1LLIAM A. HA'rcHnR,

a citizen of the United States, residing at Detroit, county ofWayne, State of Michigen, have invented certain new and useful improvements in Rotar Pumps,'of which the following is a spegi ation.

This invention relates to improvements in rotary pumps, and relates particularly to ton hasa rotating contact with the cylinder.

llhe object of the invention is to provide a structure which can be operated at high sp'eed, in which the parts will be balanced, and in which the packing is 'efi'ectively maintained. v

Ubjects which: pertain to details and economies of construction-and operation will definitely appear from the detailed description to follow.

l accomplish the objects of the invention by the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

ments of my invention are fully illustrated in the accompanying drawing, forming a part of this specification, in which? Fig.1 is a side elevation view 6f a double cylinder pump embodying the features of my invention.

Fig. '11 is. an sectional view taken on the irregular line 2-2 of Fig. I and Fig. III.

Fig. 111' is an enlar ed detail sectional view taken on'the angu arly -irregular line .3-3of FigII. j f

Fig. IV is a detail sectional view similar to that appearing in Fig. III of a single cylinder pump In the drawing the sectional views are taken looking in the direction -of the little;

arrows at the ends of the sect on lines, and

similar numerals of reference refer to simi-i that class of rotary pumps in which the pistact with the posed parallel with the main crank and Structures which are preferred embodi enlarged transverse detail the driving crank shaft 5 which extends into a supporting bearing hub 6' in the cylinder head 4. Roller bearings 7 and 8 are interposed to support the ends ofthe crank shaft, which is provided with two oppositely dis posed throws 9 and 10 turning in roller bearings 9. and 10 respectively. 7

di partition, comprising plates 11 and 12, divides the cylinder into two parts. The plates are recessed to accommodate the crank shaft at the center and to receive the shafts 13 of the auxiliary cranks which auxiliary cranks are supported in roller bearings 14..

Cylindrical pistons 15 and 16 are provided and are carried around in rolling conpli ston by the cranks 9 and 10 respectively. hese are maintained in parellelism by the pair :of auxiliary cranks 13, the crank pins 18 and 19 of which are disparallel to each other to maintain the proper relative movement of the said pistons and cylinders.

,.Th'e partition plates 11 and 12 are re tained together by bolts not shown. The cross block 22 having a retaining screw '23 and pin 24- for filling up flat spotin the rotor case or cylinder at thepartition.

A sliding vane 25, like the vane appearing in my concurrent patent application, Serial No. 446,469, filed Feb. 19, 1921, is disposed in a radial recess 25' ineach of the said cylindrical pistons. The vane is provided with lateral projections 27 engaging in transverse slots 28in the said'piston head. to As the various crank throws between'these pistons are oppositely disposed, it will be seen that one piston coiinterbalances the other and conse uently a perfectly balanced porn is secured, notwithstanding that the revo ving parts are eccentrically disposed.

a I show asin 1e piston pump operating on the same principle in Fi IV. There is of courseonl asin le cran throw there, which. I have s own ivided into parts, 31., 32, which telescope and are splined or keyed to ether. The crank shaft is provided with ba 1 bearings 29 and 30, and the main crank pin is provided with roller bearings 33. The auxiliary crank 34 has its in 35 provided with roller bearings 36 and t e pin 37 which engages the piston is provided with a roller bearing 38. Packing rings 39 and 40am provided between the piston and the cylin-' der heads. The other parts are substan- 1w roe tially counterparts of those appearing in the structure illustrated in Fig. III and are numbered with corresponding numerals;

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a rotary pump the combination of a double c linder supported upon a base provided with intake and dischar e chambers and ports, a crank shaft axia ly disposed within the said cylinder and with oppositel' disposed crank throws for each said cy cylinder with a' suitable support therefor,

provided with intake and discharge ports, a crank shaft axially disposed tov the said cylinder and with a crank and crank pin within the cylinder, a cylindrical piston of less diameter than said cylinder disposed in contact with the said cylinder and journalled upon the said crank pin, auxiliary. arallel cranks disposed between said cylu'i er and said piston and parallel to the main crank, and a radially disposed sliding vane between said piston and cylinder between the intake and discharge, coacting as specified.

3. In a rotary pump the combination of a cylinder with a suitable sup ort therefor,

rovided with intake and disc arge ports, a crank shaft axially disposed to the said cylinder and with a crank and crank pin within the cylinder, a cylindrical piston of less diameter than said cylinder disposed in contact withthe said cylinder and journalled upon the said crank pin, auxiliary parallel cranks disposed between said cylinder and said piston and parallelto the main crank, and a vane means between said piston and cylinder, coacting as specified.

4. In a rotary pump the combination of a cylinder with a support therefor, provided with intake and discharge ports, a crank shaft axially disposed to the said cylinder and with a crank pin within thecylinder, a cylindrical piston of less diameter than said cylinder disposed in contact with the said cylinder and journalled upon the said crank pin, auxiliary means connecting the said piston and cylinder to maintain the piston in parallel relation thereto during rotation, an intake and an exhaust port, and a vane means between said intake and exhaust, as described.

5. In a rotary pump the combination of a cylinder with a support therefor, a crank s aft axially disposed to the said cylinder and with a crank pin within the cylinder, a cylindrical piston of less diameter than said cylinder disposed in contact with the said cylinder and journalled upon the said crank pin, auxiliarymeans connecting the said iston and cylinder to maintain the piston in parallel relation thereto during rotation, an intake and an exhaust port, and a vane means between said intake and exhaust, as described. I

1 In witness whereof, I have hereunto set my hand and seal in the presence of two witnesses.

WILLIAM A. HATCHER. [n s.] Witnesses:

WILLIAM F. Hnazoe, HARRY E. WILLIAMS. 

